Injection control method of die cast machine
AssigneeToshiba Kikai Kabushiki Kaisha
InventorsNorihiro Iwamoto, Masayuki Takamura, Toshihiko Kaneko
Life of this patent
Estimating the term…
Abstract
A stroke-end position of an injection cylinder of the die cast machine is detected and a position of the injection cylinder for sending a boosting-signal is set. This position is a predetermined standard boost stroke distance from the stroke-end position. When the injection cylinder reaches the position for sending the boosting-signal in the casting cycle, an oil-pressure intensifier is advanced. In this method, before casting is performed, a value representing a stroke after slowing-down and a setting value of the plunger stopping position are determined and the start point for slowing-down is calculated by subtracting the value of the stroke after slowing down from the setting value.
Claims12
An injection control method of a die cast machine for injecting a molten metal into a mold cavity by advancement of an injection cylinder and then boosting the molten metal by advancement of an oil-pressure intensifier comprising the steps of:
- detecting a stroke-end position of the injection cylinder when injection of the molten metal into the mold cavity is completed;
- determining a boost-start position at a distance equal to a predetermined standard boost stroke backward from the stroke-end position, the boost-start position identifying when a boosting-signal is to be provided;
- advancing the injection cylinder to inject the molten metal into the mold cavity;
- and
- providing the boosting-signal to control the advancement of the oil-pressure intensifier when the stroke of the injection cylinder reaches the boost-start position.
An injection control method of a die cast machine for injecting a molten metal into a mold cavity in accordance with advancement of an injection plunger and for slowing down the injection plunger just before completing injection of the molten meal into the mold cavity comprising the steps of:
- determining a stroke of the injection plunger after slowing-down of the injection plunger and a set value of a stopping position of the injection plunger;
- calculating a start point of the slowing-down of the injection plunger by subtracting a value representing the stroke after the slowing-down from the set value of the plunger stopping position;
- providing a slowing-down control command to restrict a degree of divergence of an injection speed control valve for controlling movement of the injection plunger when a front end portion of the injection plunger reaches the start point of the slowing-down of the injection plunger;
- measuring a detected value of the stopping position of the injection plunger;
- recalculating the start point of the slowing-down by subtracting a value representing the stroke after slowing-down from the detected value of the plunger stopping position;
- and
- recalculating the start point of the slowing-down for a plurality of casting cycles.
Dependencies are inferred from the claim text.